I rented a Canon 70-300mm f/4-5.6 IS USM L lens and went to Granby Zoo. There was a giant dome structure inclosed with a fence. It was the home to a lot of monkeys including this wise guy! These monkeys are great subjects for photography since they express a lot of interesting emotions. As a photographer, one of the challenges in this situation is the fence. The key is to focus past the fence, so that the fence doesn't appear in the photograph. Its a little tricky, but it works.